Plotting a graph properly

%code for plotting the real values of wetted radius vs time

WR_real = real(WR);
WR_real(valid) = 0;
plot(timeSec(:,:,1),WR_real(:,:,1),'LineWidth',2)
xlabel ('Time (s)')
ylabel ('Wetted Radius (m)')
title ('Wetted Radius vs Evaporation Time')
legend('Theoretical')

Hello everyone,

I want to plot a graph and I used the attached code. However, I want to get rid of the vertical blue line on the y axis and the horizontal blue line on the x axis. I am not quite sure how this happened. Does anyone know how to solve this problem?

Thanks and regards

[KSSV]

You skip the first value and then plot.

Answer 1

[Arthur Roué]

%% Plotting
%code for plotting the real values of volume vs time
V_real = real(V);
valid = V_real<0;
V_real(valid) = 0;
plot(timeSec, V_real,'LineWidth',2)
xlabel ('Time (s)')
ylabel ('Volume (m^3)')
title ('Volume vs Evaporation Time')
legend('Theoretical')
%code for plotting the real values of wetted radius vs time
WR_real = real(WR);
WR_real(valid) = 0;
vb = WR_real ~= 0; % find 0 to remove them
plot(timeSec, WR_real,'LineWidth',2); hold on
plot(timeSec(vb), WR_real(vb),'LineWidth',2)
xlabel ('Time (s)')
ylabel ('Wetted Radius (m)')
title ('Wetted Radius vs Evaporation Time')
legend('Theoretical')

[AB]

Thank you for your help. I tried your code but I'm still getting this blue line for some reason and the red isnt converging to 0 on the x axis

[Arthur Roué]

I superpose the curve without the zero with a second plot.

plot(timeSec, WR_real,'LineWidth',2); hold on % Original curve, hold on for superposition in axe
plot(timeSec(vb), WR_real(vb),'LineWidth',2) % Curve without zero

Red is'nt going to zero because I also removed this zero. You need to process your data to keep this zero.

[AB]

ahh okay thank you for your help :)

Answer 2

[Arthur Roué]

This happens because your data looks like that :

WR_real(:,:,1) = [0 1.1 ... 0.2 0 0]*1e-3

To get rid of those lines, remove the zeros at the beginning and the end of your data (and in time vector too to match size)

[AB]

Thank you for your answer but how do I remove the zeros?

I am a bit confused

[Arthur Roué]

In your case, it seems the zeros are only at the end and beginning. Then you can remove all 0 this way :

% Get index of 0
vb = WR_real(:,:,1) ~= 0

% Plot without the 0
plot(timeSec(vb,:,1),WR_real(vb,:,1),'LineWidth',2)

EDIT : Why WR_real got 3 dimension ?